Update ax_boost_chrono.m4
Update configure.ac

Added AC_MSG_ERROR to configure.am for Ubuntu 13.10 users with libboost1.54-all-dev and libboost1.53 fatal error alert 'Could not link against libboost::chrono !' instruction to remove libboost1.54-all-dev and install libboost1.53-all-dev.
Update build-unix.md

Added Ubuntu 13.10 specific instuctions to deal with libboost1.54-all-dev incompatibility and fatal error alert 'Could not link against libboost::chrono !'
Update configure.ac
Merge branch 'master' into fix